Type cast error in engine
Type cast error in engine

MuranoPL "class" function  returns wrong result for
MuranoObjectInterface instance

Change-Id: Idface22bb707af5b0d4eecfd0809e221743a46b1
Closes-bug: #1489448

NeCTAR-RC/murano,openstack/murano,NeCTAR-RC/murano,satish-avninetworks/murano,olivierlemasle/murano,DavidPurcell/murano_temp,DavidPurcell/murano_temp,satish-avninetworks/murano,olivierlemasle/murano,olivierlemasle/murano,DavidPurcell/murano_temp,satish-avninetworks/murano,NeCTAR-RC/murano,satish-avninetworks/murano,openstack/murano,NeCTAR-RC/murano,DavidPurcell/murano_temp,olivierlemasle/murano